Formally named the Seto Inland Sea, the setonaikai is the body of water separating Honshū, Shikoku, and Kyūshū, three of the main islands of Japan. It serves as an international waterway, connecting the Pacific Ocean to the Sea of Japan.

This is a picture I shot of a small portion of the Inland Sea of Japan from Shiraishi-jima in Okayama during Golden Week using my iPhone and the Pano iPhone app.